Theiler Stage 13 - Turning of the embryo
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This is a short period with turning initiated in embryos
with 6-8 pairs of somites and usually completed in embryos with 14-16
pairs of somites. The first branchial arch has maxillary and mandibular
components but the maxillary process is not visible until later (TS16).
A second branchial arch is now evident. There is evidence of regionalisation
of the heart and the neural tube is closed from a point opposite the
outflow tract to the proximal part of the tail. Absent: 3rd branchial arch. |
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8.5 dpc (range 8-9.25) All scale bars in microns. |
